81180725481599 has 8 divisors (see below), whose sum is σ = 81257045674560. Its totient is φ = 81104426676000.

The previous prime is 81180725481521. The next prime is 81180725481601. The reversal of 81180725481599 is 99518452708118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81180725481599 - 2¹² = 81180725477503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81180725381599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2253269 + ... + 12939809.

It is an arithmetic number, because the mean of its divisors is an integer number (10157130709320).

Almost surely, 2^{81180725481599} is an apocalyptic number.

81180725481599 is a deficient number, since it is larger than the sum of its proper divisors (76320192961).

81180725481599 is a wasteful number, since it uses less digits than its factorization.

81180725481599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693681.

The product of its (nonzero) digits is 58060800, while the sum is 68.

The spelling of 81180725481599 in words is "eighty-one trillion, one hundred eighty billion, seven hundred twenty-five million, four hundred eighty-one thousand, five hundred ninety-nine".